18 and 1/20 as a decimal

1 answer:

6 0

The answer would be 18.05

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vlabodo [156]

We have:

$a_1=-3$

and:

$r=4$

so:

$$\sum\limits_{n=2}^5\,-3\cdot4^{n-1}=\sum\limits_{n=1}^5\,-3\cdot4^{n-1}-a_1=S_5-a_1=\frac{-3-(-3)\cdot 4^5}{1-4}-(-3)=$

$=\dfrac{-3-(-3)\cdot 1024}{-3}+3=\dfrac{-3(1-1024)}{-3}+3=1-1024+3=\boxed{-1020}$

It is a finite sum, so it is convergent.

6 0

2 years ago

mash [69]

Answer:

its a)the first sequence is geometric bc of the common ratio of 2. the second sequence is arithmetic bc of the common difference of 7.

8 0

2 years ago

fiasKO [112]

Answer:

the answer is option (B)

4 0

2 years ago

Rudik [331]

Answer:

D) y = -4x + 1

8 0

2 years ago

mrs_skeptik [129]

Answer A. $25.36, $75.99. I just took the test.

3 0

2 years ago